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<FONT color="green">001</FONT>    package org.apache.commons.net.ntp;<a name="line.1"></a>
<FONT color="green">002</FONT>    /*<a name="line.2"></a>
<FONT color="green">003</FONT>     * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.3"></a>
<FONT color="green">004</FONT>     * contributor license agreements.  See the NOTICE file distributed with<a name="line.4"></a>
<FONT color="green">005</FONT>     * this work for additional information regarding copyright ownership.<a name="line.5"></a>
<FONT color="green">006</FONT>     * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.6"></a>
<FONT color="green">007</FONT>     * (the "License"); you may not use this file except in compliance with<a name="line.7"></a>
<FONT color="green">008</FONT>     * the License.  You may obtain a copy of the License at<a name="line.8"></a>
<FONT color="green">009</FONT>     *<a name="line.9"></a>
<FONT color="green">010</FONT>     *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.10"></a>
<FONT color="green">011</FONT>     *<a name="line.11"></a>
<FONT color="green">012</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.12"></a>
<FONT color="green">013</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.13"></a>
<FONT color="green">014</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.14"></a>
<FONT color="green">015</FONT>     * See the License for the specific language governing permissions and<a name="line.15"></a>
<FONT color="green">016</FONT>     * limitations under the License.<a name="line.16"></a>
<FONT color="green">017</FONT>     */<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    <a name="line.19"></a>
<FONT color="green">020</FONT>    <a name="line.20"></a>
<FONT color="green">021</FONT>    import java.text.DateFormat;<a name="line.21"></a>
<FONT color="green">022</FONT>    import java.text.SimpleDateFormat;<a name="line.22"></a>
<FONT color="green">023</FONT>    import java.util.Date;<a name="line.23"></a>
<FONT color="green">024</FONT>    import java.util.Locale;<a name="line.24"></a>
<FONT color="green">025</FONT>    import java.util.TimeZone;<a name="line.25"></a>
<FONT color="green">026</FONT>    <a name="line.26"></a>
<FONT color="green">027</FONT>    /***<a name="line.27"></a>
<FONT color="green">028</FONT>     * TimeStamp class represents the Network Time Protocol (NTP) timestamp<a name="line.28"></a>
<FONT color="green">029</FONT>     * as defined in RFC-1305 and SNTP (RFC-2030). It is represented as a<a name="line.29"></a>
<FONT color="green">030</FONT>     * 64-bit unsigned fixed-point number in seconds relative to 0-hour on 1-January-1900.<a name="line.30"></a>
<FONT color="green">031</FONT>     * The 32-bit low-order bits are the fractional seconds whose precision is<a name="line.31"></a>
<FONT color="green">032</FONT>     * about 200 picoseconds. Assumes overflow date when date passes MAX_LONG<a name="line.32"></a>
<FONT color="green">033</FONT>     * and reverts back to 0 is 2036 and not 1900. Test for most significant<a name="line.33"></a>
<FONT color="green">034</FONT>     * bit: if MSB=0 then 2036 basis is used otherwise 1900 if MSB=1.<a name="line.34"></a>
<FONT color="green">035</FONT>     * &lt;p&gt;<a name="line.35"></a>
<FONT color="green">036</FONT>     * Methods exist to convert NTP timestamps to and from the equivalent Java date<a name="line.36"></a>
<FONT color="green">037</FONT>     * representation, which is the number of milliseconds since the standard base<a name="line.37"></a>
<FONT color="green">038</FONT>     * time known as "the epoch", namely January 1, 1970, 00:00:00 GMT.<a name="line.38"></a>
<FONT color="green">039</FONT>     * &lt;/p&gt;<a name="line.39"></a>
<FONT color="green">040</FONT>     *<a name="line.40"></a>
<FONT color="green">041</FONT>     * @author Jason Mathews, MITRE Corp<a name="line.41"></a>
<FONT color="green">042</FONT>     * @version $Revision: 1084392 $ $Date: 2011-03-22 22:39:08 +0000 (Tue, 22 Mar 2011) $<a name="line.42"></a>
<FONT color="green">043</FONT>     * @see java.util.Date<a name="line.43"></a>
<FONT color="green">044</FONT>     */<a name="line.44"></a>
<FONT color="green">045</FONT>    public class TimeStamp implements java.io.Serializable, Comparable&lt;TimeStamp&gt;<a name="line.45"></a>
<FONT color="green">046</FONT>    {<a name="line.46"></a>
<FONT color="green">047</FONT>        private static final long serialVersionUID = 8139806907588338737L;<a name="line.47"></a>
<FONT color="green">048</FONT>    <a name="line.48"></a>
<FONT color="green">049</FONT>        /**<a name="line.49"></a>
<FONT color="green">050</FONT>         * baseline NTP time if bit-0=0 -&gt; 7-Feb-2036 @ 06:28:16 UTC<a name="line.50"></a>
<FONT color="green">051</FONT>         */<a name="line.51"></a>
<FONT color="green">052</FONT>        protected static final long msb0baseTime = 2085978496000L;<a name="line.52"></a>
<FONT color="green">053</FONT>    <a name="line.53"></a>
<FONT color="green">054</FONT>        /**<a name="line.54"></a>
<FONT color="green">055</FONT>         *  baseline NTP time if bit-0=1 -&gt; 1-Jan-1900 @ 01:00:00 UTC<a name="line.55"></a>
<FONT color="green">056</FONT>         */<a name="line.56"></a>
<FONT color="green">057</FONT>        protected static final long msb1baseTime = -2208988800000L;<a name="line.57"></a>
<FONT color="green">058</FONT>    <a name="line.58"></a>
<FONT color="green">059</FONT>        /**<a name="line.59"></a>
<FONT color="green">060</FONT>         * Default NTP date string format. E.g. Fri, Sep 12 2003 21:06:23.860.<a name="line.60"></a>
<FONT color="green">061</FONT>         * See &lt;code&gt;java.text.SimpleDateFormat&lt;/code&gt; for code descriptions.<a name="line.61"></a>
<FONT color="green">062</FONT>         */<a name="line.62"></a>
<FONT color="green">063</FONT>        public final static String NTP_DATE_FORMAT = "EEE, MMM dd yyyy HH:mm:ss.SSS";<a name="line.63"></a>
<FONT color="green">064</FONT>    <a name="line.64"></a>
<FONT color="green">065</FONT>        /**<a name="line.65"></a>
<FONT color="green">066</FONT>         * NTP timestamp value: 64-bit unsigned fixed-point number as defined in RFC-1305<a name="line.66"></a>
<FONT color="green">067</FONT>         * with high-order 32 bits the seconds field and the low-order 32-bits the<a name="line.67"></a>
<FONT color="green">068</FONT>         * fractional field.<a name="line.68"></a>
<FONT color="green">069</FONT>         */<a name="line.69"></a>
<FONT color="green">070</FONT>        private final long ntpTime;<a name="line.70"></a>
<FONT color="green">071</FONT>    <a name="line.71"></a>
<FONT color="green">072</FONT>        private DateFormat simpleFormatter;<a name="line.72"></a>
<FONT color="green">073</FONT>        private DateFormat utcFormatter;<a name="line.73"></a>
<FONT color="green">074</FONT>    <a name="line.74"></a>
<FONT color="green">075</FONT>        // initialization of static time bases<a name="line.75"></a>
<FONT color="green">076</FONT>        /*<a name="line.76"></a>
<FONT color="green">077</FONT>        static {<a name="line.77"></a>
<FONT color="green">078</FONT>            TimeZone utcZone = TimeZone.getTimeZone("UTC");<a name="line.78"></a>
<FONT color="green">079</FONT>            Calendar calendar = Calendar.getInstance(utcZone);<a name="line.79"></a>
<FONT color="green">080</FONT>            calendar.set(1900, Calendar.JANUARY, 1, 0, 0, 0);<a name="line.80"></a>
<FONT color="green">081</FONT>            calendar.set(Calendar.MILLISECOND, 0);<a name="line.81"></a>
<FONT color="green">082</FONT>            msb1baseTime = calendar.getTime().getTime();<a name="line.82"></a>
<FONT color="green">083</FONT>            calendar.set(2036, Calendar.FEBRUARY, 7, 6, 28, 16);<a name="line.83"></a>
<FONT color="green">084</FONT>            calendar.set(Calendar.MILLISECOND, 0);<a name="line.84"></a>
<FONT color="green">085</FONT>            msb0baseTime = calendar.getTime().getTime();<a name="line.85"></a>
<FONT color="green">086</FONT>        }<a name="line.86"></a>
<FONT color="green">087</FONT>        */<a name="line.87"></a>
<FONT color="green">088</FONT>    <a name="line.88"></a>
<FONT color="green">089</FONT>        /***<a name="line.89"></a>
<FONT color="green">090</FONT>         * Constructs a newly allocated NTP timestamp object<a name="line.90"></a>
<FONT color="green">091</FONT>         * that represents the native 64-bit long argument.<a name="line.91"></a>
<FONT color="green">092</FONT>         */<a name="line.92"></a>
<FONT color="green">093</FONT>        public TimeStamp(long ntpTime)<a name="line.93"></a>
<FONT color="green">094</FONT>        {<a name="line.94"></a>
<FONT color="green">095</FONT>            this.ntpTime = ntpTime;<a name="line.95"></a>
<FONT color="green">096</FONT>        }<a name="line.96"></a>
<FONT color="green">097</FONT>    <a name="line.97"></a>
<FONT color="green">098</FONT>        /***<a name="line.98"></a>
<FONT color="green">099</FONT>         * Constructs a newly allocated NTP timestamp object<a name="line.99"></a>
<FONT color="green">100</FONT>         * that represents the value represented by the string<a name="line.100"></a>
<FONT color="green">101</FONT>         * in hexdecimal form (e.g. "c1a089bd.fc904f6d").<a name="line.101"></a>
<FONT color="green">102</FONT>         *<a name="line.102"></a>
<FONT color="green">103</FONT>         * @throws NumberFormatException - if the string does not contain a parsable timestamp.<a name="line.103"></a>
<FONT color="green">104</FONT>         */<a name="line.104"></a>
<FONT color="green">105</FONT>        public TimeStamp(String s) throws NumberFormatException<a name="line.105"></a>
<FONT color="green">106</FONT>        {<a name="line.106"></a>
<FONT color="green">107</FONT>            ntpTime = decodeNtpHexString(s);<a name="line.107"></a>
<FONT color="green">108</FONT>        }<a name="line.108"></a>
<FONT color="green">109</FONT>    <a name="line.109"></a>
<FONT color="green">110</FONT>        /***<a name="line.110"></a>
<FONT color="green">111</FONT>         * Constructs a newly allocated NTP timestamp object<a name="line.111"></a>
<FONT color="green">112</FONT>         * that represents the Java Date argument.<a name="line.112"></a>
<FONT color="green">113</FONT>         *<a name="line.113"></a>
<FONT color="green">114</FONT>         * @param d - the Date to be represented by the Timestamp object.<a name="line.114"></a>
<FONT color="green">115</FONT>         */<a name="line.115"></a>
<FONT color="green">116</FONT>        public TimeStamp(Date d)<a name="line.116"></a>
<FONT color="green">117</FONT>        {<a name="line.117"></a>
<FONT color="green">118</FONT>            ntpTime = (d == null) ? 0 : toNtpTime(d.getTime());<a name="line.118"></a>
<FONT color="green">119</FONT>        }<a name="line.119"></a>
<FONT color="green">120</FONT>    <a name="line.120"></a>
<FONT color="green">121</FONT>        /***<a name="line.121"></a>
<FONT color="green">122</FONT>         * Returns the value of this Timestamp as a long value.<a name="line.122"></a>
<FONT color="green">123</FONT>         *<a name="line.123"></a>
<FONT color="green">124</FONT>         * @return the 64-bit long value represented by this object.<a name="line.124"></a>
<FONT color="green">125</FONT>         */<a name="line.125"></a>
<FONT color="green">126</FONT>        public long ntpValue()<a name="line.126"></a>
<FONT color="green">127</FONT>        {<a name="line.127"></a>
<FONT color="green">128</FONT>            return ntpTime;<a name="line.128"></a>
<FONT color="green">129</FONT>        }<a name="line.129"></a>
<FONT color="green">130</FONT>    <a name="line.130"></a>
<FONT color="green">131</FONT>        /***<a name="line.131"></a>
<FONT color="green">132</FONT>         * Returns high-order 32-bits representing the seconds of this NTP timestamp.<a name="line.132"></a>
<FONT color="green">133</FONT>         *<a name="line.133"></a>
<FONT color="green">134</FONT>         * @return seconds represented by this NTP timestamp.<a name="line.134"></a>
<FONT color="green">135</FONT>         */<a name="line.135"></a>
<FONT color="green">136</FONT>        public long getSeconds()<a name="line.136"></a>
<FONT color="green">137</FONT>        {<a name="line.137"></a>
<FONT color="green">138</FONT>            return (ntpTime &gt;&gt;&gt; 32) &amp; 0xffffffffL;<a name="line.138"></a>
<FONT color="green">139</FONT>        }<a name="line.139"></a>
<FONT color="green">140</FONT>    <a name="line.140"></a>
<FONT color="green">141</FONT>        /***<a name="line.141"></a>
<FONT color="green">142</FONT>         * Returns low-order 32-bits representing the fractional seconds.<a name="line.142"></a>
<FONT color="green">143</FONT>         *<a name="line.143"></a>
<FONT color="green">144</FONT>         * @return fractional seconds represented by this NTP timestamp.<a name="line.144"></a>
<FONT color="green">145</FONT>         */<a name="line.145"></a>
<FONT color="green">146</FONT>        public long getFraction()<a name="line.146"></a>
<FONT color="green">147</FONT>        {<a name="line.147"></a>
<FONT color="green">148</FONT>            return ntpTime &amp; 0xffffffffL;<a name="line.148"></a>
<FONT color="green">149</FONT>        }<a name="line.149"></a>
<FONT color="green">150</FONT>    <a name="line.150"></a>
<FONT color="green">151</FONT>        /***<a name="line.151"></a>
<FONT color="green">152</FONT>         * Convert NTP timestamp to Java standard time.<a name="line.152"></a>
<FONT color="green">153</FONT>         *<a name="line.153"></a>
<FONT color="green">154</FONT>         * @return NTP Timestamp in Java time<a name="line.154"></a>
<FONT color="green">155</FONT>         */<a name="line.155"></a>
<FONT color="green">156</FONT>        public long getTime()<a name="line.156"></a>
<FONT color="green">157</FONT>        {<a name="line.157"></a>
<FONT color="green">158</FONT>            return getTime(ntpTime);<a name="line.158"></a>
<FONT color="green">159</FONT>        }<a name="line.159"></a>
<FONT color="green">160</FONT>    <a name="line.160"></a>
<FONT color="green">161</FONT>        /***<a name="line.161"></a>
<FONT color="green">162</FONT>         * Convert NTP timestamp to Java Date object.<a name="line.162"></a>
<FONT color="green">163</FONT>         *<a name="line.163"></a>
<FONT color="green">164</FONT>         * @return NTP Timestamp in Java Date<a name="line.164"></a>
<FONT color="green">165</FONT>         */<a name="line.165"></a>
<FONT color="green">166</FONT>        public Date getDate()<a name="line.166"></a>
<FONT color="green">167</FONT>        {<a name="line.167"></a>
<FONT color="green">168</FONT>            long time = getTime(ntpTime);<a name="line.168"></a>
<FONT color="green">169</FONT>            return new Date(time);<a name="line.169"></a>
<FONT color="green">170</FONT>        }<a name="line.170"></a>
<FONT color="green">171</FONT>    <a name="line.171"></a>
<FONT color="green">172</FONT>        /***<a name="line.172"></a>
<FONT color="green">173</FONT>         * Convert 64-bit NTP timestamp to Java standard time.<a name="line.173"></a>
<FONT color="green">174</FONT>         *<a name="line.174"></a>
<FONT color="green">175</FONT>         * Note that java time (milliseconds) by definition has less precision<a name="line.175"></a>
<FONT color="green">176</FONT>         * then NTP time (picoseconds) so converting NTP timestamp to java time and back<a name="line.176"></a>
<FONT color="green">177</FONT>         * to NTP timestamp loses precision. For example, Tue, Dec 17 2002 09:07:24.810 EST<a name="line.177"></a>
<FONT color="green">178</FONT>         * is represented by a single Java-based time value of f22cd1fc8a, but its<a name="line.178"></a>
<FONT color="green">179</FONT>         * NTP equivalent are all values ranging from c1a9ae1c.cf5c28f5 to c1a9ae1c.cf9db22c.<a name="line.179"></a>
<FONT color="green">180</FONT>         *<a name="line.180"></a>
<FONT color="green">181</FONT>         * @param ntpTimeValue<a name="line.181"></a>
<FONT color="green">182</FONT>         * @return the number of milliseconds since January 1, 1970, 00:00:00 GMT<a name="line.182"></a>
<FONT color="green">183</FONT>         * represented by this NTP timestamp value.<a name="line.183"></a>
<FONT color="green">184</FONT>         */<a name="line.184"></a>
<FONT color="green">185</FONT>        public static long getTime(long ntpTimeValue)<a name="line.185"></a>
<FONT color="green">186</FONT>        {<a name="line.186"></a>
<FONT color="green">187</FONT>            long seconds = (ntpTimeValue &gt;&gt;&gt; 32) &amp; 0xffffffffL;     // high-order 32-bits<a name="line.187"></a>
<FONT color="green">188</FONT>            long fraction = ntpTimeValue &amp; 0xffffffffL;             // low-order 32-bits<a name="line.188"></a>
<FONT color="green">189</FONT>    <a name="line.189"></a>
<FONT color="green">190</FONT>            // Use round-off on fractional part to preserve going to lower precision<a name="line.190"></a>
<FONT color="green">191</FONT>            fraction = Math.round(1000D * fraction / 0x100000000L);<a name="line.191"></a>
<FONT color="green">192</FONT>    <a name="line.192"></a>
<FONT color="green">193</FONT>            /*<a name="line.193"></a>
<FONT color="green">194</FONT>             * If the most significant bit (MSB) on the seconds field is set we use<a name="line.194"></a>
<FONT color="green">195</FONT>             * a different time base. The following text is a quote from RFC-2030 (SNTP v4):<a name="line.195"></a>
<FONT color="green">196</FONT>             *<a name="line.196"></a>
<FONT color="green">197</FONT>             *  If bit 0 is set, the UTC time is in the range 1968-2036 and UTC time<a name="line.197"></a>
<FONT color="green">198</FONT>             *  is reckoned from 0h 0m 0s UTC on 1 January 1900. If bit 0 is not set,<a name="line.198"></a>
<FONT color="green">199</FONT>             *  the time is in the range 2036-2104 and UTC time is reckoned from<a name="line.199"></a>
<FONT color="green">200</FONT>             *  6h 28m 16s UTC on 7 February 2036.<a name="line.200"></a>
<FONT color="green">201</FONT>             */<a name="line.201"></a>
<FONT color="green">202</FONT>            long msb = seconds &amp; 0x80000000L;<a name="line.202"></a>
<FONT color="green">203</FONT>            if (msb == 0) {<a name="line.203"></a>
<FONT color="green">204</FONT>                // use base: 7-Feb-2036 @ 06:28:16 UTC<a name="line.204"></a>
<FONT color="green">205</FONT>                return msb0baseTime + (seconds * 1000) + fraction;<a name="line.205"></a>
<FONT color="green">206</FONT>            } else {<a name="line.206"></a>
<FONT color="green">207</FONT>                // use base: 1-Jan-1900 @ 01:00:00 UTC<a name="line.207"></a>
<FONT color="green">208</FONT>                return msb1baseTime + (seconds * 1000) + fraction;<a name="line.208"></a>
<FONT color="green">209</FONT>            }<a name="line.209"></a>
<FONT color="green">210</FONT>        }<a name="line.210"></a>
<FONT color="green">211</FONT>    <a name="line.211"></a>
<FONT color="green">212</FONT>        /***<a name="line.212"></a>
<FONT color="green">213</FONT>         * Helper method to convert Java time to NTP timestamp object.<a name="line.213"></a>
<FONT color="green">214</FONT>         * Note that Java time (milliseconds) by definition has less precision<a name="line.214"></a>
<FONT color="green">215</FONT>         * then NTP time (picoseconds) so converting Ntptime to Javatime and back<a name="line.215"></a>
<FONT color="green">216</FONT>         * to Ntptime loses precision. For example, Tue, Dec 17 2002 09:07:24.810<a name="line.216"></a>
<FONT color="green">217</FONT>         * is represented by a single Java-based time value of f22cd1fc8a, but its<a name="line.217"></a>
<FONT color="green">218</FONT>         * NTP equivalent are all values from c1a9ae1c.cf5c28f5 to c1a9ae1c.cf9db22c.<a name="line.218"></a>
<FONT color="green">219</FONT>         * @param   date   the milliseconds since January 1, 1970, 00:00:00 GMT.<a name="line.219"></a>
<FONT color="green">220</FONT>         * @return NTP timestamp object at the specified date.<a name="line.220"></a>
<FONT color="green">221</FONT>         */<a name="line.221"></a>
<FONT color="green">222</FONT>        public static TimeStamp getNtpTime(long date)<a name="line.222"></a>
<FONT color="green">223</FONT>        {<a name="line.223"></a>
<FONT color="green">224</FONT>            return new TimeStamp(toNtpTime(date));<a name="line.224"></a>
<FONT color="green">225</FONT>        }<a name="line.225"></a>
<FONT color="green">226</FONT>    <a name="line.226"></a>
<FONT color="green">227</FONT>        /***<a name="line.227"></a>
<FONT color="green">228</FONT>         * Constructs a NTP timestamp object and initializes it so that<a name="line.228"></a>
<FONT color="green">229</FONT>         * it represents the time at which it was allocated, measured to the<a name="line.229"></a>
<FONT color="green">230</FONT>         * nearest millisecond.<a name="line.230"></a>
<FONT color="green">231</FONT>         * @return NTP timestamp object set to the current time.<a name="line.231"></a>
<FONT color="green">232</FONT>         * @see     java.lang.System#currentTimeMillis()<a name="line.232"></a>
<FONT color="green">233</FONT>         */<a name="line.233"></a>
<FONT color="green">234</FONT>        public static TimeStamp getCurrentTime()<a name="line.234"></a>
<FONT color="green">235</FONT>        {<a name="line.235"></a>
<FONT color="green">236</FONT>            return getNtpTime(System.currentTimeMillis());<a name="line.236"></a>
<FONT color="green">237</FONT>        }<a name="line.237"></a>
<FONT color="green">238</FONT>    <a name="line.238"></a>
<FONT color="green">239</FONT>        /***<a name="line.239"></a>
<FONT color="green">240</FONT>         * Convert NTP timestamp hexstring (e.g. "c1a089bd.fc904f6d") to the NTP<a name="line.240"></a>
<FONT color="green">241</FONT>         * 64-bit unsigned fixed-point number.<a name="line.241"></a>
<FONT color="green">242</FONT>         *<a name="line.242"></a>
<FONT color="green">243</FONT>         * @return NTP 64-bit timestamp value.<a name="line.243"></a>
<FONT color="green">244</FONT>         * @throws NumberFormatException - if the string does not contain a parsable timestamp.<a name="line.244"></a>
<FONT color="green">245</FONT>         */<a name="line.245"></a>
<FONT color="green">246</FONT>        protected static long decodeNtpHexString(String s)<a name="line.246"></a>
<FONT color="green">247</FONT>                throws NumberFormatException<a name="line.247"></a>
<FONT color="green">248</FONT>        {<a name="line.248"></a>
<FONT color="green">249</FONT>            if (s == null) {<a name="line.249"></a>
<FONT color="green">250</FONT>                throw new NumberFormatException("null");<a name="line.250"></a>
<FONT color="green">251</FONT>            }<a name="line.251"></a>
<FONT color="green">252</FONT>            int ind = s.indexOf('.');<a name="line.252"></a>
<FONT color="green">253</FONT>            if (ind == -1) {<a name="line.253"></a>
<FONT color="green">254</FONT>                if (s.length() == 0) return 0;<a name="line.254"></a>
<FONT color="green">255</FONT>                return Long.parseLong(s, 16) &lt;&lt; 32; // no decimal<a name="line.255"></a>
<FONT color="green">256</FONT>            }<a name="line.256"></a>
<FONT color="green">257</FONT>    <a name="line.257"></a>
<FONT color="green">258</FONT>            return Long.parseLong(s.substring(0, ind), 16) &lt;&lt; 32 |<a name="line.258"></a>
<FONT color="green">259</FONT>                    Long.parseLong(s.substring(ind + 1), 16);<a name="line.259"></a>
<FONT color="green">260</FONT>        }<a name="line.260"></a>
<FONT color="green">261</FONT>    <a name="line.261"></a>
<FONT color="green">262</FONT>        /***<a name="line.262"></a>
<FONT color="green">263</FONT>         * Parses the string argument as a NTP hexidecimal timestamp representation string<a name="line.263"></a>
<FONT color="green">264</FONT>         * (e.g. "c1a089bd.fc904f6d").<a name="line.264"></a>
<FONT color="green">265</FONT>         *<a name="line.265"></a>
<FONT color="green">266</FONT>         * @param s - hexstring.<a name="line.266"></a>
<FONT color="green">267</FONT>         * @return the Timestamp represented by the argument in hexidecimal.<a name="line.267"></a>
<FONT color="green">268</FONT>         * @throws NumberFormatException - if the string does not contain a parsable timestamp.<a name="line.268"></a>
<FONT color="green">269</FONT>         */<a name="line.269"></a>
<FONT color="green">270</FONT>        public static TimeStamp parseNtpString(String s)<a name="line.270"></a>
<FONT color="green">271</FONT>                throws NumberFormatException<a name="line.271"></a>
<FONT color="green">272</FONT>        {<a name="line.272"></a>
<FONT color="green">273</FONT>            return new TimeStamp(decodeNtpHexString(s));<a name="line.273"></a>
<FONT color="green">274</FONT>        }<a name="line.274"></a>
<FONT color="green">275</FONT>    <a name="line.275"></a>
<FONT color="green">276</FONT>        /***<a name="line.276"></a>
<FONT color="green">277</FONT>         * Converts Java time to 64-bit NTP time representation.<a name="line.277"></a>
<FONT color="green">278</FONT>         *<a name="line.278"></a>
<FONT color="green">279</FONT>         * @param t Java time<a name="line.279"></a>
<FONT color="green">280</FONT>         * @return NTP timestamp representation of Java time value.<a name="line.280"></a>
<FONT color="green">281</FONT>         */<a name="line.281"></a>
<FONT color="green">282</FONT>        protected static long toNtpTime(long t)<a name="line.282"></a>
<FONT color="green">283</FONT>        {<a name="line.283"></a>
<FONT color="green">284</FONT>            boolean useBase1 = t &lt; msb0baseTime;    // time &lt; Feb-2036<a name="line.284"></a>
<FONT color="green">285</FONT>            long baseTime;<a name="line.285"></a>
<FONT color="green">286</FONT>            if (useBase1) {<a name="line.286"></a>
<FONT color="green">287</FONT>                baseTime = t - msb1baseTime; // dates &lt;= Feb-2036<a name="line.287"></a>
<FONT color="green">288</FONT>            } else {<a name="line.288"></a>
<FONT color="green">289</FONT>                // if base0 needed for dates &gt;= Feb-2036<a name="line.289"></a>
<FONT color="green">290</FONT>                baseTime = t - msb0baseTime;<a name="line.290"></a>
<FONT color="green">291</FONT>            }<a name="line.291"></a>
<FONT color="green">292</FONT>    <a name="line.292"></a>
<FONT color="green">293</FONT>            long seconds = baseTime / 1000;<a name="line.293"></a>
<FONT color="green">294</FONT>            long fraction = ((baseTime % 1000) * 0x100000000L) / 1000;<a name="line.294"></a>
<FONT color="green">295</FONT>    <a name="line.295"></a>
<FONT color="green">296</FONT>            if (useBase1) {<a name="line.296"></a>
<FONT color="green">297</FONT>                seconds |= 0x80000000L; // set high-order bit if msb1baseTime 1900 used<a name="line.297"></a>
<FONT color="green">298</FONT>            }<a name="line.298"></a>
<FONT color="green">299</FONT>    <a name="line.299"></a>
<FONT color="green">300</FONT>            long time = seconds &lt;&lt; 32 | fraction;<a name="line.300"></a>
<FONT color="green">301</FONT>            return time;<a name="line.301"></a>
<FONT color="green">302</FONT>        }<a name="line.302"></a>
<FONT color="green">303</FONT>    <a name="line.303"></a>
<FONT color="green">304</FONT>        /***<a name="line.304"></a>
<FONT color="green">305</FONT>         * Computes a hashcode for this Timestamp. The result is the exclusive<a name="line.305"></a>
<FONT color="green">306</FONT>         * OR of the two halves of the primitive &lt;code&gt;long&lt;/code&gt; value<a name="line.306"></a>
<FONT color="green">307</FONT>         * represented by this &lt;code&gt;TimeStamp&lt;/code&gt; object. That is, the hashcode<a name="line.307"></a>
<FONT color="green">308</FONT>         * is the value of the expression:<a name="line.308"></a>
<FONT color="green">309</FONT>         * &lt;blockquote&gt;&lt;pre&gt;<a name="line.309"></a>
<FONT color="green">310</FONT>         * (int)(this.ntpValue()^(this.ntpValue() &gt;&gt;&gt; 32))<a name="line.310"></a>
<FONT color="green">311</FONT>         * &lt;/pre&gt;&lt;/blockquote&gt;<a name="line.311"></a>
<FONT color="green">312</FONT>         *<a name="line.312"></a>
<FONT color="green">313</FONT>         * @return  a hash code value for this object.<a name="line.313"></a>
<FONT color="green">314</FONT>         */<a name="line.314"></a>
<FONT color="green">315</FONT>        @Override<a name="line.315"></a>
<FONT color="green">316</FONT>        public int hashCode()<a name="line.316"></a>
<FONT color="green">317</FONT>        {<a name="line.317"></a>
<FONT color="green">318</FONT>            return (int) (ntpTime ^ (ntpTime &gt;&gt;&gt; 32));<a name="line.318"></a>
<FONT color="green">319</FONT>        }<a name="line.319"></a>
<FONT color="green">320</FONT>    <a name="line.320"></a>
<FONT color="green">321</FONT>        /***<a name="line.321"></a>
<FONT color="green">322</FONT>         * Compares this object against the specified object.<a name="line.322"></a>
<FONT color="green">323</FONT>         * The result is &lt;code&gt;true&lt;/code&gt; if and only if the argument is<a name="line.323"></a>
<FONT color="green">324</FONT>         * not &lt;code&gt;null&lt;/code&gt; and is a &lt;code&gt;Long&lt;/code&gt; object that<a name="line.324"></a>
<FONT color="green">325</FONT>         * contains the same &lt;code&gt;long&lt;/code&gt; value as this object.<a name="line.325"></a>
<FONT color="green">326</FONT>         *<a name="line.326"></a>
<FONT color="green">327</FONT>         * @param   obj   the object to compare with.<a name="line.327"></a>
<FONT color="green">328</FONT>         * @return  &lt;code&gt;true&lt;/code&gt; if the objects are the same;<a name="line.328"></a>
<FONT color="green">329</FONT>         *          &lt;code&gt;false&lt;/code&gt; otherwise.<a name="line.329"></a>
<FONT color="green">330</FONT>         */<a name="line.330"></a>
<FONT color="green">331</FONT>        @Override<a name="line.331"></a>
<FONT color="green">332</FONT>        public boolean equals(Object obj)<a name="line.332"></a>
<FONT color="green">333</FONT>        {<a name="line.333"></a>
<FONT color="green">334</FONT>            if (obj instanceof TimeStamp) {<a name="line.334"></a>
<FONT color="green">335</FONT>                return ntpTime == ((TimeStamp) obj).ntpValue();<a name="line.335"></a>
<FONT color="green">336</FONT>            }<a name="line.336"></a>
<FONT color="green">337</FONT>            return false;<a name="line.337"></a>
<FONT color="green">338</FONT>        }<a name="line.338"></a>
<FONT color="green">339</FONT>    <a name="line.339"></a>
<FONT color="green">340</FONT>        /***<a name="line.340"></a>
<FONT color="green">341</FONT>         * Converts this &lt;code&gt;TimeStamp&lt;/code&gt; object to a &lt;code&gt;String&lt;/code&gt;.<a name="line.341"></a>
<FONT color="green">342</FONT>         * The NTP timestamp 64-bit long value is represented as hex string with<a name="line.342"></a>
<FONT color="green">343</FONT>         * seconds separated by fractional seconds by a decimal point;<a name="line.343"></a>
<FONT color="green">344</FONT>         * e.g. c1a089bd.fc904f6d &lt;=&gt; Tue, Dec 10 2002 10:41:49.986<a name="line.344"></a>
<FONT color="green">345</FONT>         *<a name="line.345"></a>
<FONT color="green">346</FONT>         * @return NTP timestamp 64-bit long value as hex string with seconds<a name="line.346"></a>
<FONT color="green">347</FONT>         * separated by fractional seconds.<a name="line.347"></a>
<FONT color="green">348</FONT>         */<a name="line.348"></a>
<FONT color="green">349</FONT>        @Override<a name="line.349"></a>
<FONT color="green">350</FONT>        public String toString()<a name="line.350"></a>
<FONT color="green">351</FONT>        {<a name="line.351"></a>
<FONT color="green">352</FONT>            return toString(ntpTime);<a name="line.352"></a>
<FONT color="green">353</FONT>        }<a name="line.353"></a>
<FONT color="green">354</FONT>    <a name="line.354"></a>
<FONT color="green">355</FONT>        /***<a name="line.355"></a>
<FONT color="green">356</FONT>         * Left-pad 8-character hex string with 0's<a name="line.356"></a>
<FONT color="green">357</FONT>         *<a name="line.357"></a>
<FONT color="green">358</FONT>         * @param buf - StringBuilder which is appended with leading 0's.<a name="line.358"></a>
<FONT color="green">359</FONT>         * @param l - a long.<a name="line.359"></a>
<FONT color="green">360</FONT>         */<a name="line.360"></a>
<FONT color="green">361</FONT>        private static void appendHexString(StringBuilder buf, long l)<a name="line.361"></a>
<FONT color="green">362</FONT>        {<a name="line.362"></a>
<FONT color="green">363</FONT>            String s = Long.toHexString(l);<a name="line.363"></a>
<FONT color="green">364</FONT>            for (int i = s.length(); i &lt; 8; i++)<a name="line.364"></a>
<FONT color="green">365</FONT>                buf.append('0');<a name="line.365"></a>
<FONT color="green">366</FONT>            buf.append(s);<a name="line.366"></a>
<FONT color="green">367</FONT>        }<a name="line.367"></a>
<FONT color="green">368</FONT>    <a name="line.368"></a>
<FONT color="green">369</FONT>        /***<a name="line.369"></a>
<FONT color="green">370</FONT>         * Converts 64-bit NTP timestamp value to a &lt;code&gt;String&lt;/code&gt;.<a name="line.370"></a>
<FONT color="green">371</FONT>         * The NTP timestamp value is represented as hex string with<a name="line.371"></a>
<FONT color="green">372</FONT>         * seconds separated by fractional seconds by a decimal point;<a name="line.372"></a>
<FONT color="green">373</FONT>         * e.g. c1a089bd.fc904f6d &lt;=&gt; Tue, Dec 10 2002 10:41:49.986<a name="line.373"></a>
<FONT color="green">374</FONT>         *<a name="line.374"></a>
<FONT color="green">375</FONT>         * @return NTP timestamp 64-bit long value as hex string with seconds<a name="line.375"></a>
<FONT color="green">376</FONT>         * separated by fractional seconds.<a name="line.376"></a>
<FONT color="green">377</FONT>         */<a name="line.377"></a>
<FONT color="green">378</FONT>        public static String toString(long ntpTime)<a name="line.378"></a>
<FONT color="green">379</FONT>        {<a name="line.379"></a>
<FONT color="green">380</FONT>            StringBuilder buf = new StringBuilder();<a name="line.380"></a>
<FONT color="green">381</FONT>            // high-order second bits (32..63) as hexstring<a name="line.381"></a>
<FONT color="green">382</FONT>            appendHexString(buf, (ntpTime &gt;&gt;&gt; 32) &amp; 0xffffffffL);<a name="line.382"></a>
<FONT color="green">383</FONT>    <a name="line.383"></a>
<FONT color="green">384</FONT>            // low-order fractional seconds bits (0..31) as hexstring<a name="line.384"></a>
<FONT color="green">385</FONT>            buf.append('.');<a name="line.385"></a>
<FONT color="green">386</FONT>            appendHexString(buf, ntpTime &amp; 0xffffffffL);<a name="line.386"></a>
<FONT color="green">387</FONT>    <a name="line.387"></a>
<FONT color="green">388</FONT>            return buf.toString();<a name="line.388"></a>
<FONT color="green">389</FONT>        }<a name="line.389"></a>
<FONT color="green">390</FONT>    <a name="line.390"></a>
<FONT color="green">391</FONT>        /***<a name="line.391"></a>
<FONT color="green">392</FONT>         * Converts this &lt;code&gt;TimeStamp&lt;/code&gt; object to a &lt;code&gt;String&lt;/code&gt;<a name="line.392"></a>
<FONT color="green">393</FONT>         * of the form:<a name="line.393"></a>
<FONT color="green">394</FONT>         * &lt;blockquote&gt;&lt;pre&gt;<a name="line.394"></a>
<FONT color="green">395</FONT>         * EEE, MMM dd yyyy HH:mm:ss.SSS&lt;/pre&gt;&lt;/blockquote&gt;<a name="line.395"></a>
<FONT color="green">396</FONT>         * See java.text.SimpleDataFormat for code descriptions.<a name="line.396"></a>
<FONT color="green">397</FONT>         *<a name="line.397"></a>
<FONT color="green">398</FONT>         * @return  a string representation of this date.<a name="line.398"></a>
<FONT color="green">399</FONT>         */<a name="line.399"></a>
<FONT color="green">400</FONT>        public String toDateString()<a name="line.400"></a>
<FONT color="green">401</FONT>        {<a name="line.401"></a>
<FONT color="green">402</FONT>            if (simpleFormatter == null) {<a name="line.402"></a>
<FONT color="green">403</FONT>                simpleFormatter = new SimpleDateFormat(NTP_DATE_FORMAT, Locale.US);<a name="line.403"></a>
<FONT color="green">404</FONT>                simpleFormatter.setTimeZone(TimeZone.getDefault());<a name="line.404"></a>
<FONT color="green">405</FONT>            }<a name="line.405"></a>
<FONT color="green">406</FONT>            Date ntpDate = getDate();<a name="line.406"></a>
<FONT color="green">407</FONT>            return simpleFormatter.format(ntpDate);<a name="line.407"></a>
<FONT color="green">408</FONT>        }<a name="line.408"></a>
<FONT color="green">409</FONT>    <a name="line.409"></a>
<FONT color="green">410</FONT>        /***<a name="line.410"></a>
<FONT color="green">411</FONT>         * Converts this &lt;code&gt;TimeStamp&lt;/code&gt; object to a &lt;code&gt;String&lt;/code&gt;<a name="line.411"></a>
<FONT color="green">412</FONT>         * of the form:<a name="line.412"></a>
<FONT color="green">413</FONT>         * &lt;blockquote&gt;&lt;pre&gt;<a name="line.413"></a>
<FONT color="green">414</FONT>         * EEE, MMM dd yyyy HH:mm:ss.SSS UTC&lt;/pre&gt;&lt;/blockquote&gt;<a name="line.414"></a>
<FONT color="green">415</FONT>         * See java.text.SimpleDataFormat for code descriptions.<a name="line.415"></a>
<FONT color="green">416</FONT>         *<a name="line.416"></a>
<FONT color="green">417</FONT>         * @return  a string representation of this date in UTC.<a name="line.417"></a>
<FONT color="green">418</FONT>         */<a name="line.418"></a>
<FONT color="green">419</FONT>        public String toUTCString()<a name="line.419"></a>
<FONT color="green">420</FONT>        {<a name="line.420"></a>
<FONT color="green">421</FONT>            if (utcFormatter == null) {<a name="line.421"></a>
<FONT color="green">422</FONT>                utcFormatter = new SimpleDateFormat(NTP_DATE_FORMAT + " 'UTC'",<a name="line.422"></a>
<FONT color="green">423</FONT>                        Locale.US);<a name="line.423"></a>
<FONT color="green">424</FONT>                utcFormatter.setTimeZone(TimeZone.getTimeZone("UTC"));<a name="line.424"></a>
<FONT color="green">425</FONT>            }<a name="line.425"></a>
<FONT color="green">426</FONT>            Date ntpDate = getDate();<a name="line.426"></a>
<FONT color="green">427</FONT>            return utcFormatter.format(ntpDate);<a name="line.427"></a>
<FONT color="green">428</FONT>        }<a name="line.428"></a>
<FONT color="green">429</FONT>    <a name="line.429"></a>
<FONT color="green">430</FONT>        /***<a name="line.430"></a>
<FONT color="green">431</FONT>         * Compares two Timestamps numerically.<a name="line.431"></a>
<FONT color="green">432</FONT>         *<a name="line.432"></a>
<FONT color="green">433</FONT>         * @param   anotherTimeStamp - the &lt;code&gt;TimeStamp&lt;/code&gt; to be compared.<a name="line.433"></a>
<FONT color="green">434</FONT>         * @return  the value &lt;code&gt;0&lt;/code&gt; if the argument TimeStamp is equal to<a name="line.434"></a>
<FONT color="green">435</FONT>         *          this TimeStamp; a value less than &lt;code&gt;0&lt;/code&gt; if this TimeStamp<a name="line.435"></a>
<FONT color="green">436</FONT>         *          is numerically less than the TimeStamp argument; and a<a name="line.436"></a>
<FONT color="green">437</FONT>         *          value greater than &lt;code&gt;0&lt;/code&gt; if this TimeStamp is<a name="line.437"></a>
<FONT color="green">438</FONT>         *          numerically greater than the TimeStamp argument<a name="line.438"></a>
<FONT color="green">439</FONT>         *          (signed comparison).<a name="line.439"></a>
<FONT color="green">440</FONT>         */<a name="line.440"></a>
<FONT color="green">441</FONT>        public int compareTo(TimeStamp anotherTimeStamp)<a name="line.441"></a>
<FONT color="green">442</FONT>        {<a name="line.442"></a>
<FONT color="green">443</FONT>            long thisVal = this.ntpTime;<a name="line.443"></a>
<FONT color="green">444</FONT>            long anotherVal = anotherTimeStamp.ntpTime;<a name="line.444"></a>
<FONT color="green">445</FONT>            return (thisVal &lt; anotherVal ? -1 : (thisVal == anotherVal ? 0 : 1));<a name="line.445"></a>
<FONT color="green">446</FONT>        }<a name="line.446"></a>
<FONT color="green">447</FONT>    <a name="line.447"></a>
<FONT color="green">448</FONT>    }<a name="line.448"></a>




























































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